MST MST Steering & Control Systems 2

Question 1

When installing a new mechanical steering cable, the cable must be lubricated with what type of grease?

Accepted Answer

Marine-grade grease compatible with the cable conduit material

Answer

Marine-grade grease should be applied to the cable at the helm and cylinder ends to reduce friction and prevent corrosion.

Question 2

What is the correct method for measuring the helm effort (steering force) to verify compliance with ABYC P-17?

Accepted Answer

Use a torque wrench or spring scale at the rim of the steering wheel with the engine running at rated RPM

Answer

ABYC P-17 specifies maximum allowable rim pull force at the steering wheel, measured while the engine is running at rated speed in forward gear.

Question 3

A boat equipped with Sea Star hydraulic steering has a cylinder that drifts off center when the helm is held steady. This symptom indicates:

Accepted Answer

An internal leak past the cylinder piston seals or a leaking helm valve

Answer

Cylinder drift (the engine slowly steering itself off-center) is caused by internal bypass past worn piston seals or a leaking helm steering valve.

Question 4

What type of fluid is used in most marine hydraulic steering systems?

Accepted Answer

Automatic transmission fluid (ATF) or dedicated marine hydraulic steering fluid

Answer

Most marine hydraulic steering systems use ATF or a manufacturer-specified hydraulic steering fluid — consult the OEM manual for the correct specification.

Question 5

What is the function of the helm check valves in a hydraulic steering system?

Accepted Answer

To prevent reverse flow from the cylinder back through the helm pump

Answer

Helm check valves block reverse flow from the steering cylinder to the pump, maintaining steering position when hydraulic pressure fluctuates.

(MST) Marine Service Technician Practice Test

(MST) Marine Service Technician Practice Test

MST MST Steering & Control Systems 2